Improvement in hot-air furnaces



J. CHILCOTT.

Hot Air Furnace'. l A No. 51'921' Patented .lalny 1866.

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V.JOHN OHILOOTT, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN HOT-AIR FURNACES.

Specification forming part of Letters Patent No. 51,921, dated January 9, 1866,' antedated December 28, 1865.

To all whom it may concern.-

Be it known that I, JOHN C uILoo'rT, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and usefulImprovement in Air-Heatin g Furnaces 5 and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l is a transverse vertical section of a series of ues and intervening air-heating passages illustrating` my improvement, the plane of such section being indicated by aline, z z, in Figs. 2 and 4. Fig. 2 is a longitudinal vertical section ofthe same, in the plane indicated by the line wm in Fig. l. Fig. 3 is a longitudinal vertical section of the same, in the plane indicated by the line g/yin Fig. l. Fig. 4 is a plan view of the interiors of the flues, as exhibited by the removal of the upper slab, of which the series of iiues and air-heatingpassages are composed.

Similar letters of reference indicate corresponding parts in the several gures.

This invention consists in a novel arrangement and construction of the fines and airpassages of an air-heating furnace, whereby the heat is very effectively and economically employed and provision is afforded for cleaning out the flu'es whenever necessary.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and operation.

The ilues A A, represented of circular form in their transverse section, are arranged parallel with each other in two or more tiers, one above another, those in each tier having communication at opposite ends, alternately, in such manner, as represented in Fig. 4, that the gaseous products of combustion, entering the tirst tierfrozn the ire-placethrou gh an opening, b, Figs. 1 and 2, circulate back and forth, asindicated by arrows in that iigure, through one ue after another before passing out through an upward outlet, a., Figs. l and 4, to the first iiue of the next tier above, through which they circulate back and forth in a similar manner before escaping through a similar outlet to the next tier, the circulation being continued in this-way through the several tiers before esleave room between them for caping from the uppermost one through an opening, c, to the chimney or uptake. The lues in the several tiers are so arranged relatively to each other, as shown in Fig. l, as to the air-heating passages B B, which are represented of quedrangular form in their transverse section, and are arranged parallel with and between the ues in tiers, one above another, in such manner that each of said passages is nearly surrounded by four tlues, two above and two below, and thereby heated on all sides.

The air-heatin g passages are separate and independent of each other, and open at both ends in such manner that a free circulation of air may take place through them. In order to provide for a free circulation of air through the said passages, the said passages and liues should have a slight inclination from the horizontal position, so that theair entering attheir lower ends in acool state, and becomingheated, may circulate upward. The flues and air-pas sages, so arranged, may be arranged directly over the tire-place, or in any convenient position which will allow the gaseous products of combustion to enter the opening` b, anda suitable air-trunk or conductor should be properly arranged in relation to the air-passages to convey the heated air to where it is required, either for warming a building, heating a kiln or drying-room, or for any other purposes.

The iues and air-heati ng passages are constructed in a series ot' slabs of tire-brick or plates of cast-iron, G D D E,which are placed one upon another, and fitted together with tongues and grooves ce, to keep them in their proper relative positions and prevent such leakage of air and gas as would be prejudicial to the operation of the apparatus. rIhe several lues and air-passages are constructed half in one and half in the next slab or plate above or below. The lowest slab orplate, O, has formed in its upper side only half of each ot'its lowest tier of tiues, and the top slab or plate, E, has formed in its lower side only the upper half of each ot' the highesttierof tlues. Theinterveningslabs or plates D D have each formed in one side halt' of each of the dues of one tier, and in the other sidehalf of each of the air-passages. The slabs or plates thus constructed can be easily put together in building and A2. The construction of such continuous series of ues and intervening air-passages in slabs or plates C D D E, iu Which each of the said flues and air-passages are half in one and half in the next slab, a plate above or below it, substantially as herein described.

JOHN GHILCOTT.

XVitnesses:

HIPPOLYTE MALr, J. W. CooMBs. 

